Kidney ultrasound is usually unable to detect nephritis because the principle of ultrasound is to send sound waves through the ultrasound diagnostic instrument and enter the body, the body receives the sound waves and reflects them back through different media, the ultrasound diagnostic instrument receives the information reflected back from the ultrasound, and when the inflammation is not enough to cause morphological and structural changes inside the organ, then the ultrasound examination has no performance. The typical clinical manifestations of nephritis are hematuria, proteinuria, edema, and hypertension, accompanied by varying degrees of renal function decay, and the diagnosis of nephritis is based mainly on routine urine tests and changes in renal function, at this time, because the kidneys do not have structural changes, so the ultrasound performance of the kidneys is normal, only when the development of advanced renal failure, there will be double kidney atrophy, when the ultrasound can be observed in both kidneys become smaller At this time, the ultrasound can observe that both kidneys have become smaller, the peritoneum of the kidneys is uneven and shows diffuse damage.